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Three ammeters P,Q and R with internal resistances r, 1.5r ,3r respectively . Q and R parallel and this combination is in series with P , The whole combination connected between X and Y . When the battery connected between X and Y , the ratio of the readings of P,Q and R is

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2:1:1

3:2:1

3:1:2

1:1:1

answer is B.

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Detailed Solution

$i = \frac{V}{R}$

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